AV1 to WMV Converter

Convert AV1 to WMV: What This Tutorial Covers

This walks through turning an AV1 video — a .av1 raw bitstream, or AV1 inside an .mkv or .webm download — into a .wmv file, Microsoft's Windows Media Video. Be honest about the direction of travel before you start: AV1 is a state-of-the-art, royalty-free codec released in 2018, and WMV's default codec dates to the early-2000s Windows Media era. Converting AV1 to WMV is a step down in efficiency, not an upgrade — you do it for compatibility with old Windows-only tooling, not for quality. If your real goal is a small file that plays everywhere, AV1 to MP4 is the better target. Convert to WMV only when a specific Windows-Media workflow demands it.

How to Convert AV1 to WMV

1. Upload Your AV1 File: Drag and drop your AV1 file onto the page, or click "+ Add Files" to browse. AV1 usually ships inside an .mkv or .webm container; both are accepted, and batch upload lets you queue several clips and convert them with the same settings.
2. Pick Quality Preset or Bitrate Mode: The video codec defaults to WMV 2 (Windows Media Video 8) and the audio to WMA v2, the standard pairing inside a WMV file. Leave Quality Preset on "Very High (Recommended)", or switch to Constant Bitrate / Variable Bitrate to target a specific bitrate — see the walk-through below.
3. Resolution and Trim (Optional): Under Video resolution choose "Keep original", a Preset Resolution, Resolution Percentage, or a custom Width x Height. Use Trim → Time Range to cut a single segment out of a longer clip in the same pass.
4. Convert and Download: Click "Convert" and save your .wmv file. No sign-up, no watermark.

Walk-through: You Are Re-encoding Down a Generation

There is no shortcut here: AV1 to WMV is always a full re-encode, never a remux. AV1 and WMV are different codecs from different eras, so the AV1 picture is decoded and re-compressed to WMV 2 from scratch. Two honest consequences shape every setting you pick:

• No quality is regained, and efficiency is lost. AV1 delivers roughly 30% or more better compression than the codecs of its day; WMV 2 (Windows Media Video 8) is far less efficient. To hold the same visual quality, the WMV step needs more bits than the AV1 source used — or, at the same bitrate, quality drops. A WMV pass cannot add back detail the AV1 encode already discarded.
• It is a lossy-to-lossy conversion. Both codecs are lossy, so each generation sheds a little fidelity. The protection is to give the WMV step enough bits that second-generation softening stays invisible.

The single rule that protects you: don't starve the WMV encode.

• Leave Quality Preset on "Very High (Recommended)" unless a downstream tool forces a size budget.
• If a bitrate ceiling is required, switch File Compression to Constant Bitrate or Variable Bitrate and set the target there rather than dropping the preset.
• Keep "Keep original" resolution. Upscaling a 1080p AV1 clip to a 4K preset enlarges the frame but invents no new detail and only inflates the file.
• The audio is re-encoded to WMA v2; pick a generous preset so the soundtrack stays clean through the second lossy step.

AV1 vs WMV at a Glance

Roughly two decades separate these two codecs, and every row below reflects that gap. The conversion is worth doing only when the right-hand column is a hard requirement of whatever software you are feeding.

Windows Media Codec Choices in the Output

A .wmv file is an ASF container, and the Advanced Options menus let you choose which Windows Media codecs go inside it. The defaults are the right answer in almost every case; the older variants exist for genuinely old targets.

Common Errors and How to Fix Them

• "My phone or browser refuses the .wmv" — that is expected. WMV is a Windows-Media format with thin support outside Windows; for phones, browsers, and social uploads use AV1 to MP4 instead.
• "The WMV is bigger than my AV1 source" — also expected. WMV 2 is much less efficient than AV1, so at a high preset the WMV can be larger than the original. Lower the bitrate with Variable Bitrate, or stay on AV1/H.264 in MP4 if size matters.
• "Windows Media Player won't open the file" — confirm the download finished, and that the player is current. Very old WMP builds occasionally need the matching Windows Media codec; VLC plays WMV on every desktop without extra codecs.
• "Output looks soft or blocky" — you either upscaled an SD-or-lower source or starved the encode of bits. Set Video resolution to "Keep original" and raise the preset.
• "Converted clip plays but has no sound" — the source had no audio track, or its stream failed to decode. Confirm the original actually carries audio before converting.

When This Doesn't Work

If the AV1 file is corrupted or only partially downloaded, the bitstream may not decode cleanly and the conversion will fail or come out broken — re-download the source rather than fight a bad file. A bare .av1 raw bitstream that won't preview locally usually just needs a current player: VLC 3.0.5 and later decode AV1 through the dav1d decoder. And if your real goal is a small, widely playable file rather than a Windows-Media file, WMV is the wrong target — outside the Windows ecosystem its support is thin and its default codec is older and less efficient than what an MP4 carries, so use AV1 to MP4. WMV earns its place only when something specifically wants Windows Media Video: a legacy Windows Media Player or Windows Movie Maker project, an older PowerPoint deck that embeds .wmv natively, or a Windows-only application that won't read anything else.

Frequently Asked Questions

Should I convert AV1 to WMV at all, or to MP4 instead?

For almost every modern use, choose MP4. AV1 is the modern royalty-free codec from the Alliance for Open Media (released March 28, 2018); WMV is Microsoft's Windows Media Video, a proprietary format from the Windows Media era whose default WMV 8 / WMV 2 codec is older and far less efficient. Converting AV1 down to WMV loses compression efficiency and gains you nothing but Windows-Media compatibility. Pick WMV only when a specific Windows workflow demands it — an old Windows Media Player or Movie Maker project, a Windows-only tool, or a legacy PowerPoint that embeds .wmv clips. If you just want a file that plays everywhere, use AV1 to MP4.

Will converting AV1 to WMV improve quality or make the file smaller?

No on both counts, and that is an honest limit rather than a tool flaw. AV1 to WMV is a lossy-to-lossy re-encode to an older, less efficient codec, so it cannot regain detail and it cannot beat AV1 on size. To match the source's visual quality the WMV step typically needs a higher bitrate than the AV1 file used; at the same bitrate, quality drops instead. Keep "Keep original" resolution and a high preset to minimize the second-generation loss.

Which WMV codec and audio does the output use?

The video defaults to WMV 2, the FourCC for Windows Media Video 8, and the audio to WMA v2 (Windows Media Audio) — the standard pairing inside a .wmv file, which is itself an ASF (Advanced Systems Format) container; the last ASF specification revision dates to December 2004, underlining how legacy this target is. Under the Video Codec menu you can switch to WMV 1 (Windows Media Video 7) if an older target requires it.

My AV1 is inside a .mkv or .webm file — can XConvert still read it?

Yes. AV1 is a video codec, not a container, so it ships inside MKV (the yt-dlp default), WebM (web streaming), or as a bare .av1 bitstream. XConvert detects the AV1 stream regardless of the wrapper and re-encodes it to WMV. If you only needed a different container around a modern codec rather than a Windows-Media file, AV1 to MP4 is the path that keeps efficiency.

Why does some old Windows software demand a WMV instead of AV1?

Because AV1 (2018) is far newer than the tools. Legacy Windows Media Player builds, Windows Movie Maker, and older PowerPoint on Windows embed and play Windows Media (.wmv) clips natively but have no idea what AV1 is — there was no AV1 when they were written. A WMV drops straight into those workflows without an external codec. Newer PowerPoint (2013+) and current apps handle MP4/H.264 directly, so for anything modern convert to AV1 to MP4 instead.

Will the WMV keep my AV1 file's HDR or 10-bit colour?

No. AV1 can carry 10-bit and 12-bit video with HDR10 or HLG signalling, which is a large part of why it is used for modern streaming. Windows Media Video 8 is an 8-bit codec from long before HDR existed as a consumer format, and the ASF container has no mechanism for HDR metadata. So a 10-bit HDR AV1 source comes out as standard 8-bit SDR video: the picture is still watchable, but the extended highlight and colour range is gone and cannot be recovered from the WMV afterwards. If your source is HDR and you care about keeping it, do not convert to WMV — keep the AV1, or use AV1 to MP4, where modern codecs can carry the HDR signalling forward.

Can I convert the WMV back to AV1 later?

You can, with WMV to AV1, but understand what you would be getting. The round trip is lossy in both directions: the AV1 to WMV step discards detail to fit an older, less efficient codec, and converting back re-encodes that already-degraded picture a third time. The result would be a small, modern-codec file that looks like the WMV, not like your original AV1. Keep the original AV1 file rather than relying on a round trip — that way the WMV is a disposable copy made for one stubborn piece of Windows software, and your good version stays untouched.

How are my files handled, and how long are they kept?

Your file is uploaded over an encrypted connection, processed on our servers, and deleted automatically a few hours after the conversion — no sign-up, no watermark, never shared or made public. In our testing, an AV1 clip pulled from an .mkv download converted at the "Very High" preset opened in both Windows Media Player and VLC without an extra codec download, but the resulting .wmv was noticeably larger than the AV1 source — the expected cost of trading a 2018 codec for a Windows Media one.